CN115647169B - Pressure adjusting device and method for hydraulic forming branch pipe of large-caliber ultra-long pipeline - Google Patents
Pressure adjusting device and method for hydraulic forming branch pipe of large-caliber ultra-long pipeline Download PDFInfo
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- CN115647169B CN115647169B CN202211572814.3A CN202211572814A CN115647169B CN 115647169 B CN115647169 B CN 115647169B CN 202211572814 A CN202211572814 A CN 202211572814A CN 115647169 B CN115647169 B CN 115647169B
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Abstract
The invention discloses a pressure regulating device and a method for a hydraulic forming branch pipe of a large-caliber overlong pipeline, which relate to the field of cold extrusion of the large-caliber overlong pipeline and comprise an upper positioning and supporting device, a lower positioning and supporting device, a hydraulic thrust amplifying device, an upper die, a lower die, a left horizontal cylinder plug, a right horizontal cylinder plug, a pipe blank, a liquid injection and discharge device, a hydraulic monitoring mechanism and a pneumatic monitoring mechanism; the lower die is used for fixing the pipe blank, and the middle part of the lower die is provided with a groove; the tube blank is arranged in the groove of the lower die; the upper die is arranged on the upper sides of the pipe blank and the lower die, a groove is formed in the bottom of the middle of the upper die and used for accommodating the pipe blank, and a forming hole is formed in the middle of the upper die in a penetrating mode; according to the invention, by arranging the upper and lower positioning and supporting devices, the hydraulic thrust amplifying device, the hydraulic monitoring mechanism and the pneumatic monitoring mechanism, the monitoring performance of hydraulic pressure and pneumatic pressure is realized, and the pressure is conveniently, accurately and efficiently applied and adjusted.
Description
Technical Field
The invention relates to the field of cold extrusion of large-caliber overlong pipelines, in particular to a pressure adjusting device and method for a hydraulic forming branch pipe of a large-caliber overlong pipeline.
Background
In the field of manufacturing a tee joint or a branch pipe by cold extrusion of a pipeline, when the inner diameter of the pipeline is more than or equal to 720mm, the pipeline is defined as a large-diameter pipeline, and when the length of a single-section pipeline is more than or equal to 1500mm, the pipeline is defined as an ultra-long pipeline, so that the large-diameter ultra-long pipeline refers to a pipeline with the inner diameter of more than or equal to 720mm and the length of the single section of the pipeline is more than or equal to 1500 mm.
In most of the traditional methods for cold extruding branch pipes of pipelines, a hydraulic extrusion forming mode is adopted, and the space inside the pipeline is completely filled with liquid. When the large-caliber overlong pipeline adopts the hydraulic extrusion branch pipe, because the inner space of the large-caliber overlong pipeline is too large, if the traditional method for extruding the branch pipe by cold pipeline is adopted, a large amount of liquid needs to be filled into the pipeline, the pipeline becomes very heavy in this time, and when the liquid is subsequently injected, the hydraulic pressure in the pipeline slowly rises and is difficult. Therefore, if the traditional method for cold extruding branch pipes by using the large-caliber overlong pipeline is adopted, the whole cold extrusion molding becomes dangerous, the production efficiency is slow, and the production cost is high.
Aiming at the problems, in order to improve the safety of the production process, improve the precision and quality of products, improve the production efficiency, reduce the production cost and ensure that the hydraulic process is accurate and controllable, the pressure regulating device and the method for the large-caliber overlong pipeline hydraulic forming branch pipe are provided.
Disclosure of Invention
In order to solve the technical problems, the technical scheme solves the problems that when the large-caliber overlong pipeline provided by the background technology adopts a hydraulic extrusion branch pipe, the inner space of the large-caliber overlong pipeline is too large, if a traditional pipeline cold extrusion branch pipe method is adopted, a large amount of liquid needs to be filled into the pipeline, the pipeline is very heavy at this moment, and when liquid is injected subsequently, the hydraulic pressure in the pipeline slowly rises and is difficult.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a pressure regulating device for a hydraulic forming branch pipe of a large-caliber overlong pipeline comprises:
the lower die is used for fixing the pipe blank, and a groove is formed in the middle of the lower die;
the tube blank is arranged in the groove of the lower die;
the upper die is arranged on the upper sides of the tube blank and the lower die, a groove is formed in the bottom of the middle of the upper die and used for accommodating the tube blank, a forming hole penetrates through the middle of the upper die and is used for providing a space for expanding the tube blank and guiding the shape of the tube blank to expand;
the positioning and supporting device comprises an upper positioning and supporting device and a lower positioning and supporting device, the upper positioning and supporting device and the lower positioning and supporting device are symmetrically arranged in the tube blank from top to bottom, the upper positioning and supporting device and the lower positioning and supporting device are in contact with the inner wall of the tube blank, and a leak hole is formed in the middle of the top of the upper positioning and supporting device in a penetrating manner;
the hydraulic thrust amplifying device is fixedly installed between the upper positioning and supporting device and the lower positioning and supporting device through bolts, a support pillar is installed in the hydraulic thrust amplifying device, and the hydraulic thrust amplifying device is used for converting, increasing and outputting hydraulic pressure to the support pillar;
the left horizontal cylinder plug and the right horizontal cylinder plug are sealed on the inner sides of two ends of the tube blank in a sliding manner, an upper positioning support device and a lower positioning support device are fixed on the left horizontal cylinder plug and the right horizontal cylinder plug from the side faces, and the left horizontal cylinder plug and the right horizontal cylinder plug are combined with the tube blank into a whole;
the liquid injection and discharge device is respectively arranged in the middle of the right horizontal cylinder plug and the left horizontal cylinder plug, the end part of the liquid injection and discharge device is positioned in the pipe blank, and the liquid injection and discharge device is used for filling liquid and releasing the inner space of the pipe blank;
the hydraulic monitoring mechanism is arranged at the upper end of the right horizontal cylinder plug;
the air pressure monitoring mechanism is arranged at the upper end of a right horizontal cylinder plug, one end of the air pressure monitoring mechanism is arranged in the tube blank and is in butt joint with the hydraulic thrust amplification device, and the air pressure monitoring mechanism is used for monitoring the air pressure in the cavity of the hydraulic thrust amplification device.
Preferably, the contact parts of the upper positioning and supporting device and the lower positioning and supporting device and the pipe blank are arc surfaces, and a plurality of through holes are formed in the upper positioning and supporting device and the lower positioning and supporting device.
Preferably, hydraulic pressure thrust amplification device includes that cavity device, hydraulic pressure accept the fore-set device, supporting spring, stand pipe, relief valve and atmospheric pressure adjusting connection pipe, and a plurality of strengthening rib is installed to cavity device's outer wall, strengthening rib evenly distributed is outside at cavity device, the strengthening rib sets up along the vertical direction, the strengthening rib is used for reinforceing cavity device structure, and a plurality of opening has been seted up to cavity device's lower extreme, the opening is semi-circular, opening evenly distributed is in cavity device bottom, and a plurality of round hole has been seted up to cavity device's upper and lower terminal surface, the round hole passes through the bolt and links into whole with last location support device and lower location support device.
Preferably, the hydraulic supporting top column device comprises a top column and a hydraulic supporting surface, the top column is in sliding connection with the top of the cavity device, the hydraulic supporting surface is in sliding connection with the inner wall of the cavity device, the top column is fixedly connected to the middle of the upper surface of the hydraulic supporting surface, a supporting spring is fixed to the bottom surface of the inner cavity of the cavity device and is used for limiting the lower end of the hydraulic supporting top column device, a guide pipe is fixedly connected to the center of the upper end face of the cavity device and is in sliding connection with the top column, a pressure release valve is fixedly connected to the outside of the cavity device and is used for releasing the gas pressure in the cavity device, an air pressure adjusting connecting pipe is fixedly connected to the right side of the cavity device and is connected with an air pressure monitoring mechanism, and a loop is formed in a sealing cavity of the hydraulic thrust amplifying device through the air pressure adjusting connecting pipe and the air pressure monitoring mechanism.
Preferably, the left horizontal cylinder plug and the right horizontal cylinder plug are matched with the inner diameter of the tube blank, a closed space is formed inside the tube blank by the left horizontal cylinder plug and the right horizontal cylinder plug, and a channel for installing a hydraulic monitoring mechanism and an air pressure monitoring mechanism is arranged on the right horizontal cylinder plug.
Preferably, the hydraulic monitoring mechanism consists of a hydraulic bearing device and a digital display, the digital display is arranged outside the tube blank, the hydraulic bearing device is arranged at one end of the hydraulic monitoring mechanism, and the hydraulic bearing device is positioned inside the tube blank.
Preferably, the top column is in contact with the tube blank deformation zone.
A pressure adjusting method for a hydraulic forming branch pipe of a large-caliber overlong pipeline comprises the following steps:
the method comprises the following steps: placing the tube blank of the large-caliber overlong pipeline on a lower die, and adjusting the placement position;
step two: the upper die and the lower die are fastened to restrain the tube blank;
step three: the upper positioning and supporting device, the lower positioning and supporting device and the hydraulic thrust amplifying device are fastened together by bolts, and after being hoisted, the upper positioning and supporting device and the lower positioning and supporting device are horizontally pushed into the tube blank to a set position;
step four: fixedly installing a hydraulic monitoring mechanism on the right horizontal cylinder plug, and detecting whether the hydraulic monitoring mechanism can normally operate;
step five: the air pressure monitoring mechanism penetrates through the right horizontal cylinder plug to be connected with the hydraulic thrust amplifying device, so that the sealing performance of a penetrating area is ensured;
step six: starting the left horizontal cylinder plug and the right horizontal cylinder plug to contact with two ends of the upper positioning support device and the lower positioning support device, and providing pre-tightening pressure to a certain degree;
step seven: starting the liquid injection and discharge devices carried by the left horizontal cylinder plug and the right horizontal cylinder plug to inject liquid, and performing hydraulic forming on a set area of the pipe blank;
step eight: starting the liquid injecting and discharging devices carried by the left horizontal cylinder plug and the right horizontal cylinder plug, starting the liquid discharging function, discharging liquid in the sealed cavity, moving the left horizontal cylinder plug and the right horizontal cylinder plug after the liquid in the tube blank is completely discharged, disassembling the connection between the hydraulic thrust amplifying device and the air pressure monitoring mechanism, then moving an integral component formed by the upper positioning support device, the lower positioning support device and the hydraulic thrust amplifying device out of the tube blank, then lifting the upper die, and transferring the extruded tube to a station from the lower die.
Preferably, the seventh step includes the steps of:
starting the liquid injection and discharge devices carried by the left horizontal cylinder plug and the right horizontal cylinder plug, starting the liquid injection function, and continuously filling liquid into the tube blank by the liquid injection and discharge devices at the two ends at a large flow rate until the sealing cavity is filled with the liquid;
starting a pressure reduction function of the air pressure monitoring mechanism, keeping the air pressure in a state of not more than 0.1MPa, simultaneously reducing the speed of some liquid injection, and observing a digital display value of the hydraulic monitoring mechanism;
observing whether a to-be-formed area of a branch pipe of the pipe blank is deformed or not through a forming opening of the upper die, reading and recording a hydraulic value on a hydraulic monitoring mechanism when the central area of the to-be-formed area of the branch pipe is observed to be deformed, starting a pressurization function of an air pressure monitoring mechanism, increasing the air pressure to a preset value, and stopping continuous liquid injection at the moment;
when the periphery of the to-be-formed area of the branch pipe is deformed, reading a digital display value of the hydraulic monitoring mechanism, further reducing the speed of liquid injection, keeping the digital display value of the hydraulic monitoring mechanism unchanged, and continuously deforming the to-be-formed area of the branch pipe;
and stopping injecting liquid when the branch pipe on the pipe blank is extruded to the designed height, and closing the air pressure monitoring mechanism.
Compared with the prior art, the invention provides a pressure regulating device and a pressure regulating method for a hydraulic forming branch pipe of a large-caliber ultra-long pipeline, which have the following beneficial effects:
by arranging the upper positioning and supporting device, the lower positioning and supporting device, the hydraulic thrust amplifying device, the left horizontal cylinder plug, the right horizontal cylinder plug, the pipe blank, the liquid injection and discharge device, the hydraulic monitoring mechanism and the pneumatic monitoring mechanism, aiming at the problem that a large-caliber overlong pipeline hydraulic forming branch pipe is easy to generate, a set of hydraulic thrust amplifying device and a control method are designed, hydraulic thrust can be amplified reasonably and effectively and transferred to a part needing extrusion forming, the requirement for injecting liquid into the pipe blank can be greatly reduced, so that the liquid consumption and the liquid injection time are reduced, the safety of a production process can be greatly improved, the production efficiency is obviously improved, and the production cost is reduced; meanwhile, the hydraulic pressure and air pressure monitoring performance is realized by adding the hydraulic pressure monitoring mechanism and the air pressure monitoring mechanism, the pressure is conveniently, accurately and efficiently applied and adjusted, and the product precision and quality are better.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention;
FIG. 3 is a schematic illustration of an explosive structure according to the present invention;
FIG. 4 is a schematic view of the internal structure of the hydraulic thrust amplifying device according to the present invention;
FIG. 5 is a schematic structural diagram of a hydraulic thrust amplification device of the present invention;
FIG. 6 is a schematic flow diagram of a pressure regulation method of the present invention;
the reference numbers in the figures are:
1. an upper positioning support device; 2. a lower positioning support device; 3. a hydraulic thrust amplification device; 4. a lower die; 5. an upper die; 6. a left horizontal cylinder plug; 7. a right horizontal cylinder plug; 8. a liquid injection and discharge device; 9. a hydraulic monitoring mechanism; 10. an air pressure monitoring mechanism; 11. a pipe blank; 12. a cavity device; 13. a hydraulic support jack device; 13-1, a top column; 13-2, hydraulic bearing surfaces; 14. a support spring; 15. a guide tube; 16. a pressure relief valve; 17. the atmospheric pressure adjusts the connecting tube.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Referring to fig. 1-6, a pressure regulating device and method for a large-caliber overlong pipeline hydraulic forming branch pipe comprises an upper positioning support device 1, a lower positioning support device 2, a hydraulic thrust amplifying device 3, an upper die 5, a lower die 4, a left horizontal cylinder plug 6, a right horizontal cylinder plug 7, a pipe blank 11, a liquid injection and discharge device 8, a hydraulic monitoring mechanism 9 and a pneumatic monitoring mechanism 10;
the lower die 4 is used for fixing the tube blank 11, and a groove is formed in the middle of the lower die 4;
the tube blank 11 is arranged in the groove of the lower die 4;
the upper die 5 is arranged on the upper sides of the tube blank 11 and the lower die 4, a groove is formed in the bottom of the middle of the upper die 5 and used for accommodating the tube blank 11, and a forming hole is formed in the middle of the upper die 5 in a penetrating mode and used for providing a space for expanding the tube blank 11 and guiding the tube blank 11 to expand;
the upper positioning and supporting device 1 and the lower positioning and supporting device 2 are symmetrically arranged in the tube blank 11 from top to bottom, the upper positioning and supporting device 1 and the lower positioning and supporting device 2 are used for being in supporting contact with the inner wall of the large-caliber overlong tube blank 11, the upper positioning and supporting device 1 and the lower positioning and supporting device 2 are also used for connecting and fixing a hydraulic thrust amplifying device 3, the upper positioning and supporting device 1 and the lower positioning and supporting device 2 provide a reaction force of the hydraulic thrust amplifying device 3, and a leak hole is formed in the middle of the top of the upper positioning and supporting device 1 in a penetrating mode;
a jacking column 13-1 is installed inside the hydraulic thrust amplifying device 3, the hydraulic thrust amplifying device 3 is used for converting hydraulic pressure into the jacking column 13-1, the hydraulic thrust amplifying device 3 further increases the hydraulic pressure at the jacking head of the jacking column 13-1, the hydraulic thrust amplifying device 3 is positioned between the upper positioning support device 1 and the lower positioning support device 2, and the hydraulic thrust amplifying device 3 is fixedly installed through bolt connection;
the left horizontal cylinder plug 6 and the right horizontal cylinder plug 7 are sealed at the inner sides of two ends of the tube blank 11 in a sliding manner, the left horizontal cylinder plug 6 and the right horizontal cylinder plug 7 are used for fixing the upper positioning support device 1 and the lower positioning support device 2 from the side, and the left horizontal cylinder plug 6 and the right horizontal cylinder plug 7 are combined with the tube blank 11 into a whole;
the liquid injection and discharge device 8 is arranged in the middle of the right horizontal cylinder plug 7, the end part of the liquid injection and discharge device 8 is positioned in the pipe blank 11, the liquid injection and discharge device 8 is used for filling liquid and releasing the inner space of the pipe blank 11, high-pressure liquid is injected into the liquid injection and discharge device 8 in the cold press molding stage, and a tee joint or a branch pipe is extruded at a preset position on the pipe blank 11;
the hydraulic monitoring mechanism 9 is arranged at the upper end of the right horizontal cylinder plug 7, the measuring end of the hydraulic monitoring mechanism 9 is positioned in the pipe blank 11, a digital display device and a digital display panel are arranged at the outer side end of the hydraulic monitoring mechanism 9, the hydraulic monitoring mechanism 9 is used for monitoring the pressure of liquid injected into the cavity of the pipe blank 11 at the right time, and the hydraulic monitoring mechanism 9 feeds the current condition back to the external digital display panel through the digital display device;
the air pressure monitoring mechanism 10 is installed at the upper end of the right horizontal cylinder plug 7, the part, located in the tube blank 11, of the air pressure monitoring mechanism 10 is butted on the hydraulic thrust amplification device 3, a digital display device and a digital display panel are installed outside the air pressure monitoring mechanism 10, the air pressure monitoring mechanism 10 is used for timely monitoring the air pressure in the cavity of the hydraulic thrust amplification device 3, the current condition of the air pressure monitoring mechanism 10 is fed back to the peripheral digital display panel through the digital display device, the air pressure monitoring mechanism 10 reduces or increases the air pressure in the cavity of the hydraulic thrust amplification device 3, and the extrusion pressure at the top end of the ejection column 13-1 is correspondingly reduced or increased.
Specifically, the position of going up location support device 1 and location support device 2 and the contact of pipe 11 down is the high accuracy circular arc, the circular arc is convenient for go up location support device 1 and location support device 2 and the assembly of pipe 11 down, has seted up a plurality of through-hole on going up location support device 1 and the location support device 2 down, the through-hole is convenient for liquid to get into fast and fills 11 internal cavities of pipe.
The hydraulic thrust amplifying device 3 comprises a cavity device 12, a hydraulic bearing support pillar device 13, a supporting spring 14, a guide pipe 15, a pressure release valve 16 and an air pressure adjusting connecting pipe 17, wherein sealed air is arranged inside the cavity device 12; the outer wall of the cavity device 12 is provided with a plurality of reinforcing ribs, the reinforcing ribs are uniformly distributed outside the cavity device 12 and are arranged along the vertical direction, and the reinforcing ribs are used for reinforcing the structure of the cavity device 12; the lower end of the cavity device 12 is provided with a plurality of openings, the openings are semicircular, the openings are uniformly distributed at the bottom end of the cavity device 12, and the openings are convenient for liquid to enter and fill the cavity device 12; the upper end surface and the lower end surface of the cavity device 12 are provided with a plurality of round holes, the round holes are connected with the upper positioning support device 1 and the lower positioning support device 2 into a whole through bolts, the hydraulic supporting top column device 13 comprises a top column 13-1 and a hydraulic supporting surface 13-2, the top column 13-1 is connected with the top of the cavity device 12 in a sliding way, the hydraulic supporting surface 13-2 is connected with the inner wall of the cavity device 12 in a sliding way, the top column 13-1 is fixedly connected with the middle part of the upper surface of the hydraulic supporting surface 13-2, the diameter of the hydraulic supporting surface 13-2 is at least 3 times of that of the top column 13-1, a supporting spring 14 is fixed on the bottom surface of the inner cavity of the cavity device 12, and the supporting spring 14 is used for limiting the lower end of the hydraulic supporting top column device 13, a liquid storage space is reserved between the hydraulic bearing surface 13-2 and the bottom surface of the inner cavity of the cavity device 12, the liquid storage space is convenient for liquid to apply pressure to the hydraulic bearing surface 13-2, a guide pipe 15 is fixedly connected to the central position above the upper end surface of the cavity device 12, the guide pipe 15 is in sliding connection with the top column 13-1, the guide pipe 15 plays a role in guiding the top column 13-1, a pressure release valve 16 is fixedly connected to the outside of the cavity device 12, the pressure release valve 16 is used for releasing gas pressure in the cavity device 12, a gas pressure adjusting connecting pipe 17 is fixedly connected to the right side of the cavity device 12, the gas pressure adjusting connecting pipe 17 is connected with the gas pressure monitoring mechanism 10, and a loop is formed in a sealing cavity of the hydraulic thrust amplification device 3 and the gas pressure monitoring mechanism 10 through the gas pressure adjusting connecting pipe 17;
by utilizing the design that the hydraulic receiving surface 13-2 is larger than the cross section of the top column 13-1, when the same liquid pressure is received on the cross section, the hydraulic receiving surface 13-2 with the larger cross section area can receive larger pressure from the liquid, thereby generating pressure for pushing the hydraulic receiving top column device 13 to move upwards. When the cross-sectional diameter of the hydraulic receiving surface 13-2 is 3 times the cross-sectional diameter of the top pillar 13-1, the cross-sectional area of the hydraulic receiving surface 13-2 is actually 9 times the cross-sectional area of the top pillar 13-1, and it can be obtained from the formula F = p · S, that is, the pressure = pressure × area, the pressure of the liquid received by the cross-section of the hydraulic receiving surface 13-2 is 9 times the cross-sectional area of the top pillar 13-1, and the pressure increases as the pressure of the liquid increases. This device is therefore referred to as a hydraulic thrust amplifying device 3. When the hydraulic thrust amplifying device 3 is subjected to a hydraulic pressure, when the hydraulic thrust amplifying device 3 is subjected to a sufficiently large external liquid pressure, namely, when the external liquid pressure is sufficient to overcome gravity and friction, the hydraulic pressure receiving ejection device 13 generates a rising trend, and the trend causes the inner wall of the tube blank 11 to be subjected to an upward acting force from the ejection column 13-1;
during the rising process of the hydraulic receiving ejection device 13, the air sealed inside the cavity device 12 is compressed, so that the pressure of the air is increased, and the hydraulic receiving surface 13-2 of the hydraulic receiving ejection device 13 generates gas pressure which hinders the rising of the whole device. At this time, the air pressure inside the whole sealed cavity is reduced by the air pressure monitoring mechanism 10, and the hydraulic support ram device 13 is not significantly obstructed by the air pressure, so that the obstruction force caused by the compressed air is not worried about.
The left horizontal cylinder plug 6 and the right horizontal cylinder plug 7 are matched with the inner diameter of the tube blank 11, the left horizontal cylinder plug 6 and the right horizontal cylinder plug 7 move axially inside the tube blank 11, and the left horizontal cylinder plug 6 and the right horizontal cylinder plug 7 form a local closed space in a selected area inside the tube blank 11, so that liquid required for filling the closed space can be greatly reduced, liquid used for forming enough deformation pressure to be injected can also be greatly reduced, and a channel for installing the hydraulic monitoring mechanism 9 and the air pressure monitoring mechanism 10 is arranged on the right horizontal cylinder plug 7.
The hydraulic monitoring mechanism 9 is composed of a hydraulic supporting device, a digital display and a data line, the digital display is arranged outside the tube blank 11, and the digital display feeds back the hydraulic pressure in the sealed cavity of the tube blank 11 so as to adjust the injection pressure and the injection speed when injecting liquid into the tube blank 11.
The air pressure monitoring mechanism 10 and the sealing cavity of the hydraulic thrust amplifying device 3 are connected into a whole to form a controllable system, so that the air pressure in the cavity can be reduced when the pipe wall in the early stage needs large pressure to deform, and the hydraulic thrust amplifying device 3 can conveniently amplify and convert hydraulic pressure quickly; after the pipe wall is deformed to a certain degree in the later stage, the air pressure in the cavity is increased, the extrusion force generated by the hydraulic thrust amplifying device 3 is properly reduced, and the phenomenon that the pressure generated by the hydraulic thrust amplifying device 3 is too large to cause the uneven wall thickness of the branch pipe formed by extrusion is avoided.
The ejection column 13-1 of the hydraulic thrust amplifying device 3 is locally contacted with the set deformation area of the tube blank 11, the rest deformation area of the tube blank 11 is contacted with the liquid in the hydraulic thrust amplifying device 3, when the hydraulic branch pipe of the large-caliber overlong pipeline is used, the ejection column 13-1 of the hydraulic thrust amplifying device 3 is only locally contacted with the set deformation area and does not cover the whole deformation area, the deformation area is left to be deformed under the hydraulic action, and therefore the cold pressing branch pipe is completed under the combined action of the hydraulic pressure and the hydraulic thrust amplifying device 3.
The method comprises the following steps:
the method comprises the following steps: placing the tube blank 11 of the large-caliber overlong pipeline on the lower die 4, and adjusting the placing position;
step two: the upper die 5 is tightly buckled with the lower die 4 to restrain the tube blank 11;
step three: the upper positioning and supporting device 1, the lower positioning and supporting device 2 and the hydraulic thrust amplifying device 3 are fastened together by bolts, then hoisted, horizontally pushed into the tube blank 11 and pushed to a set position;
step four: the hydraulic monitoring mechanism 9 is fixedly installed on the right horizontal cylinder plug 7, and whether the hydraulic monitoring mechanism 9 can normally operate is detected;
step five: the air pressure monitoring mechanism 10 penetrates through the right horizontal cylinder plug 7 to be connected with the hydraulic thrust amplifying device 3, so that the sealing performance of a penetrating area is guaranteed;
step six: starting a left horizontal cylinder plug 6 and a right horizontal cylinder plug 7 to contact with two ends of the upper positioning and supporting device 1 and the lower positioning and supporting device 2, and providing pre-tightening pressure to a certain degree;
step seven: starting the liquid injection and discharge devices 8 carried by the left horizontal cylinder plug 6 and the right horizontal cylinder plug 7, starting the liquid injection function, and continuously filling liquid into the tube blank 11 by the liquid injection and discharge devices 8 at the two ends at a large flow rate until the sealing cavity is filled with the liquid;
starting the pressure reduction function of the air pressure monitoring mechanism 10, keeping the air pressure in a state of not more than 0.1MPa, reducing the speed of some liquid injection, and observing the digital display value of the hydraulic monitoring mechanism 9;
observing whether a to-be-formed area of a branch pipe of the pipe blank 11 is deformed or not through a forming opening of the upper die 5, reading and recording a hydraulic value on the hydraulic monitoring mechanism 9 when the central area of the to-be-formed area of the branch pipe is observed to be deformed, starting a pressurizing function of the air pressure monitoring mechanism 10, increasing the air pressure to a plurality of MPa, and stopping continuous liquid injection at the moment; when the periphery of the to-be-formed area of the branch pipe is deformed, reading a digital display value of the hydraulic monitoring mechanism 9, further reducing the liquid injection speed, keeping the digital display value of the hydraulic monitoring mechanism 9 unchanged, and continuously deforming the to-be-formed area of the branch pipe; stopping injecting liquid when the branch pipes on the pipe blank 11 are extruded to the designed height, and closing the air pressure monitoring mechanism 10;
step eight: starting a liquid injection and discharging device 8 carried by a left horizontal cylinder plug 6 and a right horizontal cylinder plug 7, starting a liquid discharging function, discharging liquid in a sealed cavity, after the liquid in a tube blank 11 is completely discharged, firstly removing the left horizontal cylinder plug 6 and the right horizontal cylinder plug 7, disassembling the connection between a hydraulic thrust amplifying device 3 and an air pressure monitoring mechanism 10, then moving an integral component consisting of an upper positioning and supporting device 1, a lower positioning and supporting device 2 and the hydraulic thrust amplifying device 3 out of the tube blank 11, then lifting an upper die 5, and transferring an extruded tube piece to a station from a lower die 4.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The utility model provides a pressure regulating device of heavy-calibre overlength pipeline hydroforming branch pipe which characterized in that includes:
the lower die (4) is used for fixing the tube blank (11), and a groove is formed in the middle of the lower die (4);
the pipe blank (11), the said pipe blank (11) is set up in the recess of the lower die (4);
the pipe blank expanding device comprises an upper die (5), wherein the upper die (5) is arranged on the upper sides of a pipe blank (11) and a lower die (4), a groove is formed in the middle bottom of the upper die (5), the groove is used for accommodating the pipe blank (11), a forming hole penetrates through the middle of the upper die (5), and the forming hole is used for providing a space for expanding the pipe blank (11) and guiding the pipe blank (11) to expand;
the positioning and supporting device comprises an upper positioning and supporting device (1) and a lower positioning and supporting device (2), the upper positioning and supporting device (1) and the lower positioning and supporting device (2) are vertically and symmetrically arranged in the tube blank (11), the upper positioning and supporting device (1) and the lower positioning and supporting device (2) are in contact with the inner wall of the tube blank (11), and a leak hole is formed in the middle of the top of the upper positioning and supporting device (1) in a penetrating mode;
the hydraulic thrust amplifying device (3) is fixedly installed between the upper positioning supporting device (1) and the lower positioning supporting device (2) through bolt connection, a top column (13-1) is installed inside the hydraulic thrust amplifying device (3), and the hydraulic thrust amplifying device (3) is used for converting and increasing hydraulic pressure and outputting the hydraulic pressure to the top column (13-1);
the pipe blank positioning and supporting device comprises a left horizontal cylinder plug (6) and a right horizontal cylinder plug (7), wherein the left horizontal cylinder plug (6) and the right horizontal cylinder plug (7) are sealed at the inner sides of two ends of a pipe blank (11) in a sliding mode, an upper positioning and supporting device (1) and a lower positioning and supporting device (2) are fixed on the left horizontal cylinder plug (6) and the right horizontal cylinder plug (7) from the side faces, and the left horizontal cylinder plug (6), the right horizontal cylinder plug (7) and the pipe blank (11) are combined into a whole;
the device comprises at least one liquid injection and discharge device (8), wherein the liquid injection and discharge device (8) is respectively arranged in the middle of a right horizontal cylinder plug (7) and a left horizontal cylinder plug (6), the end part of the liquid injection and discharge device (8) is positioned in a pipe blank (11), and the liquid injection and discharge device (8) is used for filling liquid and releasing the inner space of the pipe blank (11);
the hydraulic monitoring mechanism (9), the hydraulic monitoring mechanism (9) is installed at the upper end of the right horizontal cylinder plug (7);
the device comprises a gas pressure monitoring mechanism (10), wherein the gas pressure monitoring mechanism (10) is installed at the upper end of a right horizontal cylinder plug (7), one end of the gas pressure monitoring mechanism (10) is arranged in a tube blank (11) and is in butt joint with a hydraulic thrust amplification device (3), and the gas pressure in a cavity of the hydraulic thrust amplification device (3) is monitored through the gas pressure monitoring mechanism (10).
2. The pressure regulating device for the hydraulic forming branch pipe of the large-caliber overlong pipeline according to claim 1, wherein: the contact part of the upper positioning and supporting device (1) and the lower positioning and supporting device (2) and the pipe blank (11) is an arc surface, and a plurality of through holes are formed in the upper positioning and supporting device (1) and the lower positioning and supporting device (2).
3. The pressure regulating device for the hydraulic forming branch pipe of the large-caliber overlong pipeline according to claim 1, wherein: hydraulic pressure thrust amplification device (3) include cavity device (12), hydraulic pressure and accept fore-set device (13), supporting spring (14), stand pipe (15), relief valve (16) and atmospheric pressure regulation connecting pipe (17), and a plurality of strengthening rib is installed to the outer wall of cavity device (12), strengthening rib evenly distributed is outside at cavity device (12), the strengthening rib sets up along the vertical direction, the strengthening rib is used for strengthening cavity device (12) structure, and a plurality of openings have been seted up to the lower extreme of cavity device (12), the opening is semi-circular, opening evenly distributed is in cavity device (12) bottom, and a plurality of round hole has been seted up to the upper and lower terminal surface of cavity device (12), the round hole passes through the bolt and connects into whole with last location support device (1) and lower location support device (2).
4. The pressure regulating device for the hydraulic forming branch pipe of the large-caliber overlong pipeline according to claim 3, wherein: the hydraulic receiving ejection device (13) comprises an ejection column (13-1) and a hydraulic receiving surface (13-2), the ejection column (13-1) is in sliding connection with the top of the cavity device (12), the hydraulic receiving surface (13-2) is in sliding connection with the inner wall of the cavity device (12), the ejection column (13-1) is fixedly connected to the middle of the upper surface of the hydraulic receiving surface (13-2), a supporting spring (14) is fixed to the bottom surface of the inner cavity of the cavity device (12), the supporting spring (14) is used for limiting the lower end of the hydraulic receiving ejection device (13), a guide pipe (15) is fixedly connected to the center of the upper end face of the cavity device (12) and is in sliding connection with the ejection column (13-1), a pressure release valve (16) is fixedly connected to the outer portion of the cavity device (12), the pressure release valve (16) is used for releasing gas pressure in the cavity device (12), a gas pressure adjusting connecting pipe (17) is fixedly connected to the right side of the cavity device (12), the gas pressure adjusting connecting pipe (17) is connected with a gas pressure monitoring mechanism (10), and a sealing cavity of the hydraulic thrust amplification device (3) forms a pressure adjusting loop with the monitoring mechanism (10).
5. The pressure regulating device for the hydraulic forming branch pipe of the large-caliber overlong pipeline according to claim 1, wherein: the pipe blank monitoring device is characterized in that the left horizontal cylinder plug (6) and the right horizontal cylinder plug (7) are matched with the inner diameter of the pipe blank (11), the left horizontal cylinder plug (6) and the right horizontal cylinder plug (7) form a closed space inside the pipe blank (11), and a channel for installing the hydraulic monitoring mechanism (9) and the air pressure monitoring mechanism (10) is arranged on the right horizontal cylinder plug (7).
6. The pressure regulating device for the hydraulic forming branch pipe of the large-caliber overlong pipeline as claimed in claim 1, wherein: the hydraulic monitoring mechanism (9) is composed of a hydraulic supporting device and a digital display, the digital display is arranged outside the tube blank (11), the hydraulic supporting device is arranged at one end of the hydraulic monitoring mechanism (9), and the hydraulic supporting device is located inside the tube blank (11).
7. The pressure regulating device for the hydraulic forming branch pipe of the large-caliber overlong pipeline according to claim 4, wherein: the top column (13-1) is in contact with the deformation area of the tube blank (11).
8. A pressure regulating method of a hydraulic forming branch pipe of a large-caliber overlong pipeline is suitable for the pressure regulating device of the hydraulic forming branch pipe of the large-caliber overlong pipeline as claimed in any one of claims 1 to 7, and is characterized in that: the method comprises the following steps:
the method comprises the following steps: placing a tube blank (11) of the large-caliber overlong pipeline on the lower die (4), and adjusting the placing position;
step two: the upper die (5) and the lower die (4) are fastened to restrain the tube blank (11);
step three: the upper positioning and supporting device (1), the lower positioning and supporting device (2) and the hydraulic thrust amplifying device (3) are fastened together by bolts, and after being hoisted, the upper positioning and supporting device and the hydraulic thrust amplifying device are horizontally pushed into the tube blank (11) and pushed to a set position;
step four: fixedly installing a hydraulic monitoring mechanism (9) on a right horizontal cylinder plug (7), and detecting whether the hydraulic monitoring mechanism (9) can normally operate;
step five: the air pressure monitoring mechanism (10) penetrates through the right horizontal cylinder plug (7) to be connected with the hydraulic thrust amplifying device (3) so as to ensure the sealing performance of a penetrating area;
step six: starting a left horizontal cylinder plug (6) and a right horizontal cylinder plug (7) to contact with two ends of an upper positioning support device (1) and a lower positioning support device (2) and provide pre-tightening pressure to a certain degree;
step seven: starting a liquid injection and unloading device (8) carried by a left horizontal cylinder plug (6) and a right horizontal cylinder plug (7) for injection, and performing hydraulic forming on a set area of a pipe blank (11);
step eight: starting a liquid injection and unloading device (8) carried by a left horizontal cylinder plug (6) and a right horizontal cylinder plug (7), starting a liquid unloading function, discharging liquid in a sealed cavity, after the liquid in a tube blank (11) is completely discharged, firstly removing the left horizontal cylinder plug (6) and the right horizontal cylinder plug (7), disassembling the connection of a hydraulic thrust amplifying device (3) and an air pressure monitoring mechanism (10), then moving an integral component consisting of an upper positioning and supporting device (1), a lower positioning and supporting device (2) and the hydraulic thrust amplifying device (3) out of the tube blank (11), then lifting an upper die (5), and transferring an extruded pipe fitting to a pipe fitting station from a lower die (4).
9. The pressure regulating method for the hydraulic forming branch pipe of the large-caliber overlong pipeline according to claim 8, wherein the pressure regulating method comprises the following steps: the seventh step comprises the following steps:
starting the liquid injection and discharge devices (8) carried by the left horizontal cylinder plug (6) and the right horizontal cylinder plug (7), starting the liquid injection function, and continuously filling liquid into the tube blank (11) by the liquid injection and discharge devices (8) at the two ends at a large flow rate until the sealing cavity is filled with the liquid;
starting the pressure reduction function of the air pressure monitoring mechanism (10), keeping the air pressure in a state of not more than 0.1MPa, reducing the speed of some liquid injection, and observing the numerical display value of the hydraulic monitoring mechanism (9);
observing whether a to-be-formed area of a branch pipe of the pipe blank (11) is deformed or not through a forming opening of the upper die (5), reading and recording a hydraulic value on the hydraulic monitoring mechanism (9) when the central area of the to-be-formed area of the branch pipe is observed to be deformed, starting a pressurizing function of the air pressure monitoring mechanism (10), increasing the air pressure to a preset value, and stopping continuous liquid injection at the moment;
when the periphery of the to-be-formed area of the branch pipe is deformed, reading a digital display value of the hydraulic monitoring mechanism (9), further reducing the speed of liquid injection, keeping the digital display value of the hydraulic monitoring mechanism (9) unchanged, and continuously deforming the to-be-formed area of the branch pipe;
when the branch pipe on the pipe blank (11) is extruded to the designed height, stopping injecting liquid and closing the air pressure monitoring mechanism (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211572814.3A CN115647169B (en) | 2022-12-08 | 2022-12-08 | Pressure adjusting device and method for hydraulic forming branch pipe of large-caliber ultra-long pipeline |
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| CN202211572814.3A CN115647169B (en) | 2022-12-08 | 2022-12-08 | Pressure adjusting device and method for hydraulic forming branch pipe of large-caliber ultra-long pipeline |
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| CN102886463B (en) * | 2012-09-24 | 2014-11-05 | 重庆科技学院 | Hydraulic press special for integral compound bulging of automatic driving axle |
| CN205949600U (en) * | 2016-06-03 | 2017-02-15 | 广东工业大学 | Double bend compound shaper that expands of passing through many hands or places of upsetting side by side |
| CN106270102B (en) * | 2016-10-27 | 2019-02-19 | 南昌航空大学 | A method of matching internal high pressure forming threeway overpressure and feeding relation |
| CN107020315B (en) * | 2017-05-24 | 2018-08-07 | 南昌航空大学 | A method of using polytetrafluoroethylene film partial lubrication hydroforming three-way pipe |
| CN107234160A (en) * | 2017-07-24 | 2017-10-10 | 柳州科瑞科技有限公司 | A kind of symmetrical formula threeway forming high pressure in pipe equipment |
| CN108555108B (en) * | 2018-04-13 | 2019-11-15 | 南昌航空大学 | A kind of tee tube branch pipe expansion forming method |
| CN110935779B (en) * | 2019-12-13 | 2021-05-28 | 哈尔滨工大海卓智能成形科技有限公司 | Pipe liquid-filling multidirectional extrusion forming device and method |
| CN216714867U (en) * | 2021-11-30 | 2022-06-10 | 泰州市嘉禾机械有限公司 | Enhanced hydraulic oil cylinder |
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